# GPU Passthrough on Linux

## Enable IOMMU

```bash
sudo vim /etc/default/grub
```

Add amd_iommu=on iommu=pt

`GRUB_CMDLINE_LINUX_DEFAULT="... amd_iommu=on iommu=pt"`

```bash
sudo grub-mkconfig -o /boot/grub/grub.cfg
sudo reboot
```

Verify

```bash
sudo dmesg | grep -i iommu
```

## Find GPU IDs

```bash
lspci -nn | grep -E "VGA|Audio"
```

In my case, I get

- `10de:28a0`
- `10de:22be`

## VFIO Module Options

```bash
sudo vim /etc/modprobe.d/vfio.conf
```

> ### Arch
>
> ```bash
> options vfio-pci ids=10de:28a0,10de:22be
> ```

> ### Fedora
>
> ```bash
> options vfio-pci ids=10de:28a0,10de:22be disable_vga=1
> softdep nvidia pre: vfio-pci
> softdep nouveau pre: vfio-pci
> ```

## Blacklist GPU

```bash
sudo vim /etc/modprobe.d/blacklist-gpu.conf
```

> ### Arch
>
> ```
> blacklist nouveau
> blacklist nvidia
> blacklist nvidia_drm
> blacklist nvidia_modeset
> ```

> ### Fedora
>
> ```
> blacklist nouveau
> blacklist nvidia
> blacklist nvidia_drm
> blacklist nvidia_modeset
> blacklist nvidia_uvm
> blacklist rivafb
> blacklist nvidiafb
> blacklist snd_hda_intel
> ```

## Load VFIO

> ### Arch
>
> ```bash
> sudo vim /etc/mkinitcpio.conf
> ```
>
> ```
> MODULES=(vfio vfio_iommu_type1 vfio_pci)
> ```
> 
> ```
> sudo mkinitcpio -P
> sudo reboot
> ```

> ### Fedora
>
> ```bash
> sudo vim /etc/dracut.conf.d/10-vfio.conf
> ```
>
> ```
> force_drivers+=" vfio vfio_iommu_type1 vfio_pci "
> ```
>
> ```bash
> sudo dracut -f
> ```
>
> ```bash
> sudo reboot
> ```

### Confirm Kernel Driver

```bash
lspci -nnk -d 10de:28a0
```

```bash
lspci -nnk -d 10de:22be
```

## Install Virtualization Stack

> ### Arch
>
> ```bash
> sudo pacman -S --needed virt-manager qemu-full libvirt dnsmasq ovmf swtpm
> ```

> ### Fedora
>
> ```bash
> sudo dnf install @virtualization virt-manager qemu-kvm libvirt-daemon-config-network libvirt-daemon-kvm bridge-utils edk2-ovmf swtpm
> ```